The 2K Games Forums have a list of the changes in a new patch for XCOM: Enemy Unknown that's now available to update the newly released installment in the counter-UFO strategy series (thanks Scott). Here's word on what this does:

We wanted to let you know the details for the PC update for XCOM: Enemy Unknown that went live today (10/11/12). I've included the notes on this patch below:

Various visibility/hiding optimizations

Multiplayer text chat support (press J to activate)

Mouse button 4/5 will switch soldiers in the Barracks

ESC hides the movement grid, if you do not want to commit to a move while it is activated

Squad Sight ability optimization

Fixed issue when equipping two grenades with Deep Pockets.

Fixed Rapid Fire sometimes consuming too much ammo.

SHIVs that are damaged will no longer become unusable.

Fixed some hangs/soft crashes in tactical combat.

Replaced software cursor with the operating system cursor to reduce lag and framerate dependence.

Fixed rendering bug which causes some soldierís hair to appear as if it is rendering on top of environment fog.

1080p movies are now used at all times on the PC.

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1AngryGamer wrote on Oct 12, 2012, 09:24:Does this game have random generated missions or is it all a set of scripted scenarios? How is replayibility

Its mostly random missions interspaced with story objectives and missions. I say mostly random as in there are more random missions then story mission, although that also depends on how you play the game.

There is also a race against time, Im pretty certain that certain events occurr after a fixed ammount time during your gameplay so eventually things will happen that force your hand and if you play badly you will lose. Yes you can LOSE in this game, how often does that happen in any modern game.